Crystal structure of 2,6-diaminopyridinium chloride

The asymmetric unit of the title salt, C5H8N3+center dot Cl-, comprises one half of the 2,6-diaminopyridinium cation (the other half being completed by the application of mirror symmetry) and one Cl- counter-anion, also located on the mirror plane. The amino N atom shows a significant pyramidalization, with a dihedral angle of 30.4 (14)degrees between the least-squares planes of the amino group and the non-H atoms of the 2,6-diaminopyridinium moiety. In the crystal, the cationic molecules and Cl- counter-anions are arranged in sheets parallel to (001) consisting of alternating polar and non-polar parts associated with the the Cl- anions, pyridinium and amino moieties, and the pyridine rings, respectively. N-H center dot center dot center dot Cl interactions within the polar part, as well as slipped pi-pi interactions in the non-polar part, help to establish the three-dimensional network.